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Title:Response of cool-season turfgrass to foliar applied and stabilized nitrogen fertilizers
Author(s):Henning, Shelby
Director of Research:Branham, Bruce E.
Doctoral Committee Chair(s):Branham, Bruce E.
Doctoral Committee Member(s):Briskin, Donald P.; Mulvaney, Richard L.; Voigt, Thomas B.
Department / Program:Natural Res & Env Sci
Discipline:Natural Res & Env Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Nitrogen-15 (15N)
Nitrogen fertilization
creeping bentgrass
Abstract:The objective of my work was to determine factors that affect uptake of N by cool-season turfgrasses. Experiments were conducted to determine the quantity of foliar-applied N that is absorbed by turfgrass leaves, ways to optimize the process, and whether other common management practices can affect foliar N uptake under field conditions. Studies were also carried out to determine if foliar-applied N results in greater N use efficiency than traditional soil-applied methods, as well to determine whether foliar-applied ammoniacal N sources lead to enhanced turf performance under energy stress. A further objective was to assess whether stabilized N fertilizers offered a benefit over unamended sources under field conditions. Experiments to address these objectives were carried out at the Landscape Horticulture Research Center in Urbana, IL. The results indicate that approximately 7-34% of foliar-applied N is absorbed by turfgrass within 4-6 h post application, that this uptake is not affected by common management practices, and that the main driver of foliar N uptake is spray volume, with lower spray volumes enhancing foliar uptake. Furthermore, foliar applications proved far superior to traditional soil-based applications of N fertilizer in terms of N use efficiency. No convincing evidence was obtained that foliar applications of ammoniacal N moderate energy stress when turfgrass is cultivated on a highly fertile native soil. Finally, stabilized N fertilizers were found to offer no benefit over unamended N sources to highly maintained turfgrass cultivated under field conditions.
Issue Date:2012-09-18
Rights Information:Copyright 2012 Shelby W. Henning
Date Available in IDEALS:2012-09-18
Date Deposited:2012-08

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